Soundtraxx 8-Ohm Speakers — Oval – 0.78 x 1.56″ 2 x 4cm – 678-810103

This is a great speaker for many HO and S-scale locomotives.

Dimensions: 40 x 20 x 8mm(D)
Frequency Response: 550Hz – 12kHz
Power: 1 Watt (Nominal) 1.5 Watts (Peak) 
Impedance: 8 Ohms